A sample of hard water contains 20 mg of $Ca^{++}$ ions per litre. How many milliequivalent of $Na_{

Question

A sample of hard water contains 20 mg of $Ca^{++}$ ions per litre. How many milliequivalent of $Na_{2}CO_{3}$ would be required to soften 1 litre of the sample?

Professor PC Thomas Classes · Answer

Eq wt of $Ca = 20$. 20mg = 1 meq. So 1 meq of $Na_{2}CO_{3}$ is required.